What TyroP is saying you can not navigate based only on the map. It is not approved for this purpose at all. Have you heard of the map shift, it used to happen a lot in early days of bus now unlikely due gps. However try to position yourself onto final using your map on a flight check and any self respecting checker will fail you ( in my airline anyway) or make a deal out of it. As for cruise my sop's say both to vor , as it inhances situational. Relaying on gps and a map will live you in a pot when a big bang happens. Ask youself a question why is it you set all those needels for departure and arrival if "you could do it on the map"?
Regards
PB